Method and apparatus for intermittently texturing yarn

ABSTRACT

Apparatus for and method of texturing yarn at spaced apart regions along its length including intermittently supplying fluid under pressure to a yarn texturing nozzle and releasing fluid from the nozzle during time between supply of the fluid.

111 3,710,461 [4 1 Jan. 16, 1973 United States Patent [1 1 Benson et al.

lulll ////4 88881 2222/ "nuns unuz 3 5 l mmmmm CDBBB 67800 66677 99999HHHHH #7516 75608 72479 J1,3,6,4, mnmmn 3 3 3333 m n R m ome F C S UW mr, X mm Rm BP A 5 at AT Sm N who m i A" now D GDb o w H m T n E w Mm m mm [73] Assignee: Owens-Corning Fiberglas Corpora- FOREIGN PATENTS ORAPPLICATIONS 28,675 /1897 Great Britain.......................l37/596tion 101,673 5/1941 Sweden.................................l37/596871,799 6/1961 Great Britain B [22] Filed: Nov. 23, 1970 [2]] Appl. No.:92,018

Primary ExaminerRobert R. Mackey Attorney-Staelin & Overman and RonaldC. Hudgens [52] US. 28/72.l2

ABSTRACT [51] Int. Cl. 1/16 [58] Field of Search............. ..28/l.4,72.12; 57/34 B;

137/62522 596 Apparatus for and method of texturing yarn at spaced apartregions along its length includin supplying fluid under pressure to a gintermittently yarn texturing noznozzle during time [56] ReferencesCited UNITED STATES PATENTS zle and releasing fluid from the betweensupply of the fluid.

1/1962 Breen............;.................28/72.l2X 11,550 8/1854Hatcher...........................137/625.22 7 Claims, Drawing Figuresvnpu PATH PATENTEDJAN 16 1975 I 3. 710.461

sum 2 OF 3 f- INVENTORS: I E E GUST/i1! E. BENEU:

.UUUGLAS 5.1 m" TER.

METHOD AND APPARATUS FOR INTERMITTENTLY TEXTURING YARN BACKGROUND OF THEINVENTION Conventional apparatus for producing intermittently texturedyarn can not effectively produce such yarn at processing speeds requiredfor economical operations. Speed demands have exhausted the capabilitiesof the conventional apparatus. As linear yarn speeds increase,intermittent fluid yarn texturing apparatus produces a treated yarn thatdoes not appear significantly different from continuously textured yarn.The yarns textured portions and untextured portions are not easilyperceived. In a sense, at high linearyarn speeds, prior apparatus forintermittently texturing yarn with a fluid such as air produces a yarncontinuously textured along its length.

While some prior apparatus varies yarn speed traveling through a fluidtexturing jet or nozzle to produce intermittently textured yarn, it isdifficult to control changes in yarn speed to effect a treatmentproducing yarn distinctly textured at spaced apart locations or regionsalong its length. The result is apparatus producing an essentiallycontinuously textured yarn at high yarn speeds.

Other prior apparatus supplies fluid (normally air) from time to time toa yarn texturing jet or nozzle through which yarn travels. A higherlinear yarn speeds the individual supplies of air become less distinctin the nozzle; the result is apparatus producing an essentiallycontinuously textured yarn at high yam speeds.

SUMMARY OF THE INVENTION An object of the invention is improved methodof and apparatus for producing intermittently textured yarn, especiallyat high linear yarn speeds.

Another object of the invention is intermittent yarn texturing apparatusthat includes means acting at intervals for accelerating fluid escapefrom within a yarn texturing nozzle to recurrently stop the texturing ofyarn traveling through the nozzle.

Yet another object of the invention is apparatus using a fluid yarntexturing nozzle that includes means for intermittently supplying fluidunder pressure to the chamber within the nozzle to effect texturing ofthe yarn leaving the nozzle through an outlet from the chamber common tothe fluid and yarn and means acting during interruption of air supplyreleasing fluid from the chamber to reduce the pressure therein to stopyarn texturing prior to again supplying fluid to the nozzle.

Other objects and advantages will become apparent as the invention ishereinafter described in more detail with reference made to theaccompanying drawings.

DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of apparatusfor intennittently texturing multifilament textile material such asglass strand or yarn according to the principles of the invention.

FIG. 2 is an enlarged side elevation view of the yarn texturin g nozzleand fluid regulator arrangement shown in FIG. 1.

FIG. 3 is an end elevation viewof the nozzle and regulator arrangementshown in FIG. 2.

FIG. 4 is a view in cross-section taken along the line 4--4 of FIG. 3.The figure shows a rotary valve positioned to permit a supply of fluidto the texturing nozzle.

FIG. 5 is the cross-sectional view shown in FIG. 4 with the rotary valvepositioned to release fluid from within the nozzle.

FIG. 6 is an enlarged side elevation view of an embodiment of a modifiedyarn texturing nozzle and regulator.

FIG. 7 is a somewhat simplified showing of other apparatus forintermittently texturing yarn according to the principles of theinvention.

FIG. 8 is an enlarged side elevation view of the yarn texturing nozzleand fluid regulator arrangement shown in FIG. 7.

FIG. 9 is the yarn texturing nozzle and regulator shown in FIG. 8modified to include a suction device.

DESCRIPTION OF THE PREFERRED EMBODIMENTS While the apparatus for andmethod of the invention is especially advantageous in processingcontinuous or discontinuous filament glass strand, yarn or the like, itmay also find advantageous use in processing other multifllament linearstrand-like elements of materials such as nylon, rayon, polyester orother organic or inorganic compositions. As indicated, the apparatus ofthe invention processes twisted or untwisted multifilament linearmaterial. Hence, in the specification and the claims the term yarnincludes any textile filament bundle; the bundle can be untwisted,twisted, plied, etc.

FIG. 1 shows apparatus for intermittently texturing yarn. The apparatusadvances a single glass yarn 10 from a supply package 12 wound on abobbin 14 through a fluid yarn texturing jet or nozzle 16. The nozzle 16is part of a yarn texturing arrangement 17 that effects an intermittenttexturing of the advancing glass yarn 10.

A treated yarn 18 leaves the nozzle 16. The .yarn 18 has spaced aparttextured portions or regions 20 separated by untextured portions orregions 22.

As shown, a platform 24 supports the bobbin 14.

A platform 26 above the supply package 12 supports a yarn advancingarrangement 28 including a housing 30, a yarn collector 32 for packagingthe treated yarn l8 and a liquid sizing applicator 34. The applicator 34transfers liquid sizing to the traveling treated yarn 18 before the yarnarrives at the collector 32.

The yarn advancing arrangement 28 supplies the glass yarn 10 to thefluid yarn texturing nozzle 16 and also withdraws the treated yarn 18from the nozzle 16.

The yarn advancing arrangement 28 includes a pair of spaced apartcooperating double diameter feed and take-up rolls 36 and 38 that mount.on shafts 40 and 42 respectively. These shafts rotatably mount on thehousing 30. An electric motor 44 and a suitable drive arrangement withinthe housing 30 rotate the rollers 36 and 38 together in the samedirection. As shown in FIG. 1 the rollers move in a clockwise direction.Because it is important that the peripheral speed of each of the rollers36 and 38 be the same .at corresponding points on their peripheralsurfaces, the rollers are normally identical in size. If the rollers areof different sizes, an operator must modify the drive arrangement toprovidethe same peripheral speed for each of the rollers.

Assuming that each of the rollers 36 and 38 have identical dimensions,each of these rollers includes a first cylindrical section 46 having adiameter D' and a second coaxially arranged cylinder section 48 having adiameter d that is smaller in dimension than the diameter D. When thecylindrical sections 46 ofD diameter feed the untextured' glass yarn tothe fluid yarn texturing nozzle 16 and the cylindrical sections 48 of ddiameter withdraw the treated yarn 18 from the arrangement 17, sections46 lead the strand to the nozzle 16 at a faster linear speed than thesections 48 withdraw the-treated yarn 18 from the nozzle 16. Accordinglyan amount of overfeed is made to the nozzle 16; the ratio of thediameters D/d determines the overfeed.

Referring more particularly to FIGS. 2-5, the fluid yarn texturingarrangement 17 includes the fluid texturing nozzle 16 and a fluidregulator 52. The regulator 52 intermittently supplies fluid,.normally agas such as air, under pressure to the nozzle 16 to impart spaced aparttextured or bulked regions to the speeding yarn advancing through thenozzle 16; the regulator 52 acts during the time between supply of fluidsupply to release fluid from with the nozzle 16 to reduce abruptly thepressure in the nozzle to stop yarn texturing before fluid is againsupplied to the nozzle.

In the arrangement shown in FIGS. 1 and 2, air is the yarn texturingfluid. A compressor or other suitable means supplies the air.

The apparatus can use any suitable fluid yarn texturing device. Asshown, the nozzle 16 includes a cylindrical body 54 having a chamber 56with an outlet 58 at the forward end of the body 54 for yarn and fluid.In the embodiment, the outlet 58 opens to the atmosphere and is aventuri having a converging entrance 60, a throat 62 and a divergingexit 64. A nipple or needle 66 extends from the rearward end of the body54 forward through the chamber 56 to terminate in the convergingentrance 60 of the outlet 58 short of the throat 62. A passageway 68extends lengthwise through a nipple 66 from an outer entrance region 70.The inner terminating end of the nipple passageway 68 communicates withthe outlet 58; the entrance 70 communicates with the atmosphere.

As indicated in FIG. 2 by the dashed line indicating a yarn path, yarnenters the nozzle 16 at the entrance region 70 of the nipple 66; theyarn speeds through the chamber 56 in the passageway 68. Yarn and airexit the nozzle 16 through the outlet 58. The air escaping the nozzle 16through the outlet 58 effects or imparts a texturing or bulking to theadvancing yarn.

It has been useful to use yarn texturing jet disclosed in U. S. Pat. No.3,328,863.

The fluid regulator 52 includes a rotary valve 72 with a housing 73 anda variable speed electric motor 74. The valve 72 controls air to thenozzle 16. The valve 72 connects the passageway of a fluid supply line76 with the chamber 56 of the nozzle 16 by a passageway .78 through thevalve 72 and the passageway of an extension tube 80. The tube 80 holdsthe nozzle 16 on the valve 72. Extending transversely across thepassageway 78 in the valve housing 73 is a rotatable shaft 82 that islarger in diameter than the passageway 78 and a valve passageway 84 thatproceeds transversely through the shaft 82; the passageway 84 is atright angles to and extends through the axis of rotation of the shaft82.

The motor 74 rotates the shaft 82 by a belt 86 that connects a sheave 88on the output shaft of the motor 74 with a sheave 90 on the valve shaft82. As the motor 74 rotates the shaft 82, the passageway 84 moves intoand out of communication with the fluid passageway 78. When the valvepassageway 84 communicates with the fluid passageway 78, the valve 72 isopen to the nozzle 16; air under pressure in the supply line 76 flowsinto the chamber 56.

A suitable means such as a compressor fills the supply line 76 withtexturing air.

FIG. 4 illustrates the situation where valve passageway 84 communicateswith the fluid passageway 78. Therefore the valve 72 is open for supplyto the nozzle 16. The arrows in FIG. 4 indicate the direction of airflow during air supply to the nozzle 16.

The regulator 52 includes an arrangement acting during interruption ofair supply to the nozzle 16 to abruptly release air from the chamber 56to the atmosphere for swiftly reducing the pressure in the chamber tostop yarn texturing before again supplying air to the chamber 56. In theembodiment shown there is a fluid exit or exhaust passagewayintersecting the supply passageway 78 in the housing 73 of the valve 72;the shaft 82 and passageway 84 are at the intersection. The exhaustpassageway includes a first passageway section 92 and a second or exitpassageway section 94. The first passageway section 92 communicates withthe fluid supply passageway 78 at an entrance region 96 opening onto thepassageway 78 between the shaft 82 and the nozzle 16. The other end 98of the section 92 is at the shaft 82. The shaft 82 separates the firstpassageway section 92 from the second passageway section 94. Theterminating region 98 of the passageway section 92 aligns with the exitpassageway section 94. Both sections 92 and 94 communicate with thevalve passageway 84 at the same time as the valve passageway 84 of therotating shaft 82 aligns itself with the sections.

FIG. 5 illustrates the situation where the valve 82 is open forreleasing air from the chamber 56. The passageway 84 communicates withpassageway sections 92 and 94. The arrows indicate the direction offluid flow during discharge of air from the nozzle 16.

When advancing glass yarn at high speeds, e.g. 3,000 feet per minute, ithas been useful to supply air of from 80 to 100 psig to the chamber 56of the nozzle 16. For these high yarn speeds the apparatus has producedgood intermittently textured yarn results when the motor 74 rotates theshaft 82 from 300 to 3,000 rpm s. At these high linear yarn speeds offrom 2,000 to 3,000 feet per minute or even higher, it has been possibleto produce yarn having textured regions less than 1 foot apart.

A person can vary air pressures and shaft rpm according to the yarneffect desired. Because each revolution of the shaft 82 aligns the valvepassageway 84 to communicate twice with the fluid exit passageway (e.g.passageway sections 92 and 94) and fluid passageway 78, each shaftrevolution permits two pulses of fluid to the chamber 56 to effect yarntexturing and permits two accelerated releases of fluid from the chamber56 to stop yarn texturing.

Although it is only necessary to reduce the pressure in the chamber 56an amount sufficient to stop yarn texturing, in practice the dimensionsof the exit passageway and valve passageway 84 release air to reduce thepressure within the chamber 56 to atmospheric or zero gage pressurebefore the valve 72 supplies air to the chamber 56 again.

While the motor 74 usually rotates the shaft 82 at a continuouslyvarying rpm, it is possible to rotate the shaft 82 at a constant rpm.Accordingly it is understood that a person may operate the apparatus toproduce intermittently textured yarn that has recurrent textured regionsat periodic spaced apart locations along the length of the yarn or atrandom or programed spaced apart locations along the length of the yarn.

In the embodiment shown the exit region 98 of the first passagewaysection 92 and the passageway section 94 extend in a direction generally90 of the direction the passageway 78. A person can use texturingnozzles with the passageways intersecting at other than right angles.The angle of intersection between the passageways helps determine thelocation of the textured portions 20 of the yarn 18.

When the yarn advancing arrangement 28 is located with the nozzle 16 asshown in FIG. 1, the yarn l0 travelsabout and between the peripheralsurfaces of the larger and first cylindrical sections 46 on each of thefeed and take-up rollers 36 and 38 and thence into the entrance 70 ofthe yarn texturing nozzle 16. The second cylindrical sections 48 at eachof the rollers 36 and 38 withdraw the treated yarn 18 from the outlet 58of the nozzle 16. The apparatus locates the second cylindrical section48 of the roller 38 in relation to the outlet 58 of the nozzle 16 toabruptly remove the treated yarn 18 in a lateral direction from its paththrough the nozzle 16. The yarn winds around and between the peripheralsurfaces of the cylindrical sections 46 and 48 a number of timessufficient to provide enough surface engagement to prevent slippage asthe yarn is being feed to and the treated yarn 18 is withdrawn from thenozzle 16. In practice, it has been determined that approximately 4-6times around and between each of the paths of the cylindrical sections46 and 48 is sufficient to prevent yarn slippage.

In most instances it is desirable to partially assist holding thetreated yarn 18 in place and further lock the yarn filaments in theirrespective relationship with one another. Normally itis desirable toemploy a fluid sizing applicator such as the liquid sizing applicatorunit 34. After the intermittently textured strand 18 leaves the secondsection 48 of the feed and take-up roller 36, the yarn advancesdownwardly across a sizing transfer roller 106 of the liquid sizingapplicator 34. As the treated yarn 18 travels across the surface of theroller 106, some of the sizing material on the roller surface transfersto the yarn 18.

From the applicator roller 106 the yarn 18 advances to the yarncollector 32. The yarn 18 moves from the roller 106 downwardly to a yarnguide roller 108 that is rotatably mounted on the free end of apivotally mounted tension sensing arm 110 that comprises part of theyarn collector 32. As illustrated in FIG. 1, the collector 32 is aconstant tension take-up device.

Constant tension take-up devices are available through a number ofmanufacturers and include a ten sion sensing mechanism such as thetension arm that operates electrical-mechanical controls within thedevice to vary the speed of the yarn package winding on a mandrel inaccordance with the variations in the tension in the yarn being wound.As shown the treated yarn 18 advances from the guide roller 108 to bewound as a package 112 on a mandrel 1 14. An electric motor 116 drivesthe mandrel 114. A yarn traversing mechanism 118 driven by the motorreciprocates the treated yarn 18 in a direction along the length of thepackage 112 as the advancing yarn l8 winds onto the package 112.

FIG. 6 shows a modified valve 72 indicated by the reference numeral 72'.In the arrangement of the valve 72' the exhaust passageway terminates atits inner end at the chamber 56. As shown an exhaust tube connects thechamber 56 of the nozzle 16 with the valve housing 73 of the valve 72'to complete a first section 92 of an exhaust passageway 91. The firstpassageway section 92' intersects the passageway 78 at the shaft 82 likethe passageway section 92 of the valve 72.

FlG. 7 shows another embodiment of apparatus for intermittentlytexturing linear multifilament textile material according to theprinciples of the invention. The apparatus treats two yarns. .As shown,a take-up device 200 advances glass yarn 210 and glass yarn 211 fromsupply packages 212 and 213, respectively, through a fluid yarntexturing nozzle 216. The nozzle 216 is part of a yarn texturingarrangement 217 that effects an intermittent texturing of the advancingyarns 210 and 21 1.

An intermittently textured two yarn bundle 218 leaves the texturingnozzle 216. The yarn bundle 218 comprises spaced apart textured regions220 separated by untextured regions 222. At the textured regions 220,the filaments of the yarns 210 and 211 tangle to combine or to join theyarns. At the untextured regions 222, the yarns 210 and 211 maintaintheir individual identity; they are not joined.

Each of the yarns 2-10 and 211 pass across a yarn advancing device alongits path to the texturing nozzle 216. As shown, the yarn 210 leaves thepackage 212 to pass through a pigtail 224 and across a yarn advancingdevice 226. The device 226 includes two spaced apart driven rolls 228and 230. The yarn 211 leaves the package 213 to pass through a pigtail234 and across a yarn advancing device 236. The advancing device 236includes two spaced apart driven rolls 238 and 240.

Referring more particularly to FIG. 8 the fluid yarn texturingarrangement 217 includes the texturing nozzle 216 and a fluid regulator252 that intermittently pulses air under pressure to the nozzle 216. Airpulsed to the nozzle 216 effects a spaced apart texturing or bulking ofthe yarn as the yarn and air leave the nozzle; moreover, the regulator252 acts during times between supply of the air to the nozzle to releaseair within the nozzle. The air release abruptly reduces the pressure inthe nozzle to stop yarn texturing before the regulator again allows airto the nozzle.

The fluid texturing nozzle 216 is like the nozzle 16 shown in FIGS. 1and 2.

The fluid regulator 252 includes an exhaust valve 270, a rotary supplyvalve 272 and an electric motor 274. The supply valve 272 is in a supplyline 276 that provides air under pressure to the nozzle 216. The valve272 comprises a shaft 278 and a valve passageway 280. As the shaft 278rotates, the passageway 280 moves into and out of communication with thesupply line 276. When the shaft moves and valve passageway 278 intoalignment with the supply tube 276, the valve is open to the nozzle; thepassageway 280 allows air to rush to the nozzle 216.

The exhaust valve 270 is on an auxiliary line 281. Line 281 communicateswith supply line 276. The exit or exhaust valve 270 also uses a rotaryvalve comprising a shaft 282 and a valve passageway 284 through theshaft 282. As the shaft 282 rotates, the passageway 284 moves into andout of communication with the auxiliary line 281. When the shaft 282moves the passageway 284 into alignment with the auxiliary line 281, thevalve is open for release of air; the passageway 284 allows air to rushfrom within the nozzle 216 to escape to the atmosphere.

A motor 274 rotates the shafts 278 and 282 together by belts 286 and288. The belt 286 connects the sheave 289 on the output shaft of themotor 274 with a sheave 290 on the shaft 282 of the exhaust valve 270.The drive belt 288 connects a sheave 289 with a sheave 292 on the shaft278 of the supply valve 272.

The disposition of the valve passageways'280 and 284 with respect toeach other allows only one of the valves 270 and 272 to be open at anyone time. As the motor 274 rotates the valve shafts 278 and 282, thevalves alternate being open. When the supply valve 272 is open, airrushes into the texturing nozzle 216 through the supplying line 276; theexhaust valve 270 is closed. When the supply valve 272 is closed theexhaust valve 270 is open and air speeds from the nozzle 216 to theatmosphere through auxiliary line 281.

In operation the fluid regulator arrangement 217 intermittently suppliesair to the fluid texturing nozzle 216; the exhaust valve 270 is closedduring air supply. When the supply valve 272 interrupts air to the fluidtexturing nozzle 216, the exhaust valve 270 opens to abruptly releaseair from within the nozzle 216. The release of air swiftly reducespressure in the texturing nozzle 216 to stop yarn texturing before thesupply valve 272 allows air to the nozzle 216 again.

The take-up device 200 withdraws the treated yarn 218 from the texturingnozzle 216 to wind as a package 294. The drive roll 296 engages theperiphery of the package 294 to rotate the package. A traversing device298 reciprocates the advancing yarn 218 axially of the collectingpackage 294 as the yarn 218 advances to the package.

It is possible, and at times may be advantageous to use a suction deviceto draw air from a texturing nozzle, e.g. nozzles 16 and 216. FIG. 9shows the regulator 252 modified to include a suction device 300 withthe exhaust valve 270. The suction device 300 draws air from within thenozzle 216 during the time between supply of air to reduce more rapidlythe air pressure within the nozzle 216.

We claim:

1. Apparatus for intermittently texturing yarn comprising:

a body having a chamber therein, the body having an outlet from thechamber through which both yarn and fluid leave the body;

means for linearly advancing yarn from the chamber through the outlet ata speed of at least 1,000 feetper-minute; means for intermittentlysupplying fluid under pressure to the chamber at sufficiently closeintervals to impart a continuous texturing effect to yarn leaving thebody through the outlet; and means for increasing the release of fluidfrom the chamber during time between supply of fluid to reduce pressuresufficiently rapidly within the chamber to stop yarn texturing prior tosupply of fluid to the chamber again and thereby impart spaced aparttextured regions to yarn. 2. Apparatus of claim 1 in which the means forinter mittently supplying air under pressure to the chamber and themeans for releasing air from the chamber during the time between supplyof air to reduce pressure within the chamber to stop yarn texturingprior to again supplying air to the chamber comprises a rotary valve anddrive means for actuating the rotary valve.

3. Apparatus of claim 1 in which the means for intermittently supplyingair under pressure to the chamber and the means for releasing air fromthe chamber during the time between supply of air to reduce pressurewithin the chamber to stop yarn texturing prior to again supplying airto the chamber periodically supplies and releases the air.

4. The apparatus of claim 1 in which the outlet is of fixed dimensions.

5. The method of intermittently texturing yarn comprising:

advancing yarn from a chamber through a chamber outlet at a linear speedof at least 1,000 feet-perminute;

intermittently supplying fluid under pressure to the chamber atsufficiently close intervals to impart a continuous texturing effect tothe yarn leaving the chamber through the outlet; and releasing fluidfrom the chamber during time between supply of fluid at a rate greaterthan release of fluid from the chamber during supply of fluid toaccelerate reduction of pressure with the chamber to stop yarn texturingprior to again supplying fluid to the chamber.

6. The method of texturing yarn comprising:

advancing yarn from a chamber through a chamber outlet at a linear speedof at least 1,000 feet-perminute;

intermittently supplying gas under pressure t0 the chamber atsufficiently close intervals to effect substantially continuoustexturing of the yarn leaving the chamber through the outlet; andreleasing gas from the chamber during time between supply of gas at arate greater than release of gas from the chamber during supply of suchgas to accelerate reduction of pressure within the chamber to stop yarntexturing prior to again supplying gas to the chamber. 7. The method ofpneumatically intermittently texturing yarn comprising:

advancing yarn through a texturing nozzle at a linear yarn speed of atleast 1,000 feet-per-minute;

intermittently supplying air under pressure to the texturing nozzle atsufficiently close intervals to effect continuous texturing of the yarnpassing through the nozzle; and

1. Apparatus for intermittently texturing yarn comprising: a body havinga chamber therein, the body having an outlet from the chamber throughwhich both yarN and fluid leave the body; means for linearly advancingyarn from the chamber through the outlet at a speed of at least 1,000feet-per-minute; means for intermittently supplying fluid under pressureto the chamber at sufficiently close intervals to impart a continuoustexturing effect to yarn leaving the body through the outlet; and meansfor increasing the release of fluid from the chamber during time betweensupply of fluid to reduce pressure sufficiently rapidly within thechamber to stop yarn texturing prior to supply of fluid to the chamberagain and thereby impart spaced apart textured regions to yarn. 2.Apparatus of claim 1 in which the means for intermittently supplying airunder pressure to the chamber and the means for releasing air from thechamber during the time between supply of air to reduce pressure withinthe chamber to stop yarn texturing prior to again supplying air to thechamber comprises a rotary valve and drive means for actuating therotary valve.
 3. Apparatus of claim 1 in which the means forintermittently supplying air under pressure to the chamber and the meansfor releasing air from the chamber during the time between supply of airto reduce pressure within the chamber to stop yarn texturing prior toagain supplying air to the chamber periodically supplies and releasesthe air.
 4. The apparatus of claim 1 in which the outlet is of fixeddimensions.
 5. The method of intermittently texturing yarn comprising:advancing yarn from a chamber through a chamber outlet at a linear speedof at least 1,000 feet-per-minute; intermittently supplying fluid underpressure to the chamber at sufficiently close intervals to impart acontinuous texturing effect to the yarn leaving the chamber through theoutlet; and releasing fluid from the chamber during time between supplyof fluid at a rate greater than release of fluid from the chamber duringsupply of fluid to accelerate reduction of pressure with the chamber tostop yarn texturing prior to again supplying fluid to the chamber. 6.The method of texturing yarn comprising: advancing yarn from a chamberthrough a chamber outlet at a linear speed of at least 1,000feet-per-minute; intermittently supplying gas under pressure tO thechamber at sufficiently close intervals to effect substantiallycontinuous texturing of the yarn leaving the chamber through the outlet;and releasing gas from the chamber during time between supply of gas ata rate greater than release of gas from the chamber during supply ofsuch gas to accelerate reduction of pressure within the chamber to stopyarn texturing prior to again supplying gas to the chamber.
 7. Themethod of pneumatically intermittently texturing yarn comprising:advancing yarn through a texturing nozzle at a linear yarn speed of atleast 1,000 feet-per-minute; intermittently supplying air under pressureto the texturing nozzle at sufficiently close intervals to effectcontinuous texturing of the yarn passing through the nozzle; andreleasing air from the nozzle at an increased rate during the timebetween supply of the air to reduce pressure within the nozzle at a morerapid rate than otherwise released by the nozzle to stop yarn texturingprior to supplying air to the nozzle again.